Cannabis News
Smart root zone monitoring in stone wool cultivation
In modern professional horticulture, medicinal crops such as cannabis and high-yielding vegetable production, root zone management is the cornerstone of consistent quality and yield. Rockwool substrates offer a very stable and correctable root environment, but this advantage is fully exploited when decisions are supported by reliable and well-interpreted data. Sensors in the root zone provide continuous information on water content, EC and temperature. Used correctly, they allow growers to anticipate plant needs rather than reacting to stress signals. Used incorrectly, they introduce noise, false confidence, and misdirection. The difference is in strategy, location and interpretation. Remember that sensors are just another tool and should not replace traditional monitoring methods.
Why Root Zone Monitoring Becomes Essential at Scale
Every grower evaluates the root zone, consciously or not. In smaller installations, this is often done visually and by touch: lifting blocks, assessing the color of rockwool, or observing the attitude of plants. These methods are valuable, but subjective and difficult to standardize.
As operations grow and the number of plants increases, manual assessment quickly reaches its limits. Weighing slabs or blocks on a scale adds objectivity, but at discrete moments and with significant manual labor. In larger facilities, the manpower required to continuously monitor root conditions throughout the crop is simply not available.
Root zone sensors address this reality. They provide continuous data streams that show trends, dynamics and responses to irrigation and climate change over time. In scaled cultivation, sensors are therefore not only a precision tool, but a practical necessity. Importantly, they do not replace experience; they formalize, making intuition measurable and repeatable.
© CULTIWOOL SA
Location, representation and care of sensors
A sensor does not measure the crop; measures the exact micro-environment in which it is installed. Correct positioning is therefore essential.
Sensors should be installed in the active root zone of a healthy, representative plant, at a depth where the roots remain active throughout the crop cycle. They should never be placed directly next to a drip, as this results in high moisture readings that do not reflect average root conditions. Therefore, consistent dripper placement is essential not only for block performance, but also for consistent sensor data.
The wider greenhouse context matters just as much. Sensors should not be placed in corners, edges, near walkways or in areas subject to shadows, drafts or uneven watering. Border plants and atypical sites experience conditions different from the majority of the crop and will yield data that are not representative of the compartment.
Once installed, the sensors must remain in place for the duration of the crop cycle. Repeated removal and reinsertion disturbs the structure of the rockwool, alters the local water distribution, and compromises the consistency of the data. If a sensor needs to be removed, it should never be put back in the same place. Previously used insertion points contain moisture and residual pockets that can affect EC readings. In such cases, the sensor must be installed in a new, unobstructed location.
Consistency in positioning is what allows producers to confidently recognize trends, responses and deviations.
How many sensors are enough?
A single sensor can never represent an entire greenhouse, and in most cases, not even an entire compartment. Changes in light distribution, uniformity of irrigation, air flow and plant development inevitably create them within the crop.
At the same time, the deployment of sensors must be economically rational. The goal is not maximum sensor density, but reliable representation. In practice, this means installing multiple sensors per compartment in areas with comparable growing conditions.
Instead of focusing on individual readings, the most robust approach is to work with average data. Each sensor reflects the conditions of its specific location; by combining their readings, growers create a stable reference that reduces the risk of overreaction to local changes and supports safer and more consistent decision-making. Again, a sensor is just one tool to consider.
Interpreting root zone data in rockwool
Rockwool allows precise control of the air-water ratio in the root zone. Sensors should therefore be used to observe dynamics rather than isolated values.
Meaningful interpretation is based on the behavior of the back-dry between irrigation events, wetting rate, EC stability and how these parameters respond to climatic conditions. Sudden spikes or drops often indicate improper watering, uneven distribution, or location effects rather than actual plant demand.
Root zone data gain real value when cross-referenced with climate parameters such as temperature, humidity and VPD, as well as visual observations of crops. Integrated platforms and multiple data sources, such as those enabled by solutions like SenseNL, help validate trends and clarify cause-and-effect relationships.
Selecting the right sensor for the right substrate
Not all sensors in the root zone are interchangeable. Sensor technology must be matched with the physical properties of the substrate to generate accurate and meaningful data. They must also be properly maintained and stored to ensure accuracy.
Different substrates, such as rockwool and cocopeat, have fundamentally different structures, water retention characteristics and EC dynamics. Sensors designed for cocopeat will not give reliable readings on rockwool, and vice versa.
Also in rockwool cultivation, the selection of sensors is important. Blocks and slabs differ in volume, water distribution and root development patterns. Sensors designed for stone wool blocks are therefore not always suitable for slabs, and vice versa. Matching the sensor to the substrate material and its form factor is critical to obtaining reliable root-site data.
Driving for uniformity and stability
In both medicinal and vegetable cultivation, success is defined by uniformity and repeatability. Correctly installed and correctly interpreted root zone sensors help to identify variability early, reduce differences between plants and support stable establishment or vegetation strategies.
Combined with high-quality stone wool substrates, the sensors become a powerful ally in precision farming, improving consistency without replacing the grower’s experience.
From data points to confident decisions
Root zone sensors aren’t about collecting more numbers; they are about creating clarity. When sensors are strategically placed, deployed in sufficient numbers, and handled consistently, they make rockwool farming a predictable and correctable system.
By averaging data from multiple representative locations, producers reduce risk, avoid overcorrection, and drive with confidence. In professional horticulture, where uniformity, stability and scale define success, reliable root zone data becomes the basis rather than an experiment, cycle after cycle.
For more information:
Cultiwool
(email protected)
www.cultiwool-substrate.com
CPC of Missouri-Smithville, LLC and GF Saint Mary LLC, licensed cannabis growers and manufacturers in Missouri, filed a lawsuit in the Circuit Court of Jackson County on behalf of independent wholesalers, alleging that Good Day Farm (GDF) and its network of conspiring companies and investors were harmed by an intentional, coordinated and unconstitutional scheme. The complaint alleges that the “GDF Cartel” illegally controls or manages the state’s share of dispensary licenses and uses that market power to manipulate Missouri’s $1.52 billion cannabis market for its own profit.
GDF and its co-conspirators allegedly built the cartel by arranging for third parties to invest in limited liability companies (LLCs) that then acquire additional dispensaries, cultivation and processing facilities, all of which are owned, operated or controlled by GDF. The result: The alleged cartel exercises effective control over at least 61 dispensaries, nearly triple the 22 allowed by the Missouri Constitution, with more than 10% of dispensary licenses “under substantially common control, ownership or management.” With 224 dispensaries currently licensed statewide, the alleged GDF Cartel controls more than one in four dispensary licenses in Missouri. But its influence is even greater, with alleged Cartel dispensaries accounting for more than 40% of wholesale cannabis in the state, giving it significant — and illegal — influence over all independent growers and manufacturers forced to sell through its network.
To avoid the Missouri Constitution’s 10% licensing limit and avoid regulatory oversight, the alleged cartel operates under five different brand names:
- Good Day Farm (21 dispensaries),
- CODES (20 dispensaries),
- Green light (10 dispensaries),
- Fresh Karma (6 dispensaries), and
- 3 Fifteen Primo (4 medications).
But they’re all part of a single, coordinated operation, the complaint says.
- Purchase cannabis products from non-Cartel wholesalers at artificially depressed prices;
- They supply their 61 dispensaries with the same products—mainly those produced by Cartel growers—significantly excluding products from independent wholesalers;
- Force independent drug wholesalers to purchase the Cartel’s finished products as a condition for their wholesale products to be placed on the Cartel’s drug store shelves; and
- Boycott non-cartel wholesalers who refuse to agree to anti-cartel demands.
Bob Hoffman, one of the attorneys leading the case, said: “The GDF Cartel is removing competition from the wholesale cannabis market and enriching itself with illegal profits through a counterproductive, clandestine business conspiracy. Missouri growers and manufacturers have been suffering under this scheme for a long time; many of them know something is wrong, but we don’t realize how the cartel has manipulated the market through this manipulation framework. Missourians to approve recreational cannabis in 2022 They voted for a fair and competitive market. Missouri licensed cannabis businesses that have suffered these practices should join us because they may be entitled to substantial damages.”
The complaint alleges the financial toll the Cartel has taken: Since the Cartel began illegal price-fixing, it has used its collective market power to lower wholesale prices by more than 20%, and continues to squeeze wholesalers and threaten the viability of their operations.
The unconstitutional complaint alleges that GDF knew its plan to build cartels could create legal risks for the company under the Constitution’s 10% licensing limit. The complaint quotes from a document provided by GDF to potential investors: “There can be no assurance that the Missouri Department of Cannabis Regulation will not dispute the number of marijuana dispensaries operated or supervised by the operator or its affiliates…”.
This action is brought on behalf of a putative class that includes all licensed independent wholesalers in Missouri that are not members of the alleged GDF Cartel for purposes of injunctive relief. Wholesalers who believe they have been financially harmed by the alleged Cartel’s practices should join the case because they may be entitled to substantial damages. The putative class is represented by the law firms of Feuerstein Kulick LLP and Bryan Cave Leighton Paisner LLP.
Source: Feuerstein Kulick LLP and Bryan Cave Leighton Paisner LLP
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After fifteen years of successful cooperation, managing director Moritz Böcking and the shareholders of Klasmann-Deilmann GmbH have mutually agreed to part ways. As of May 1, 2026, Moritz Böcking will hand over the position of managing director to Jan Astrup, who served as the company’s CEO in 2021/2022. Jan Astrup and Damian Ikemann will form the Board of Directors of the Klasmann-Deilmann Group from now on.
© Klasmann-Deilmann Benelux
Klasmann-Deilmann thanks Moritz Böcking for his cooperation and the progress achieved in the transformation of the Klasmann-Deilmann Group. Moritz Böcking expanded Klasmann-Deilmann beyond the growing media business into new areas of commercial horticulture and promoted innovation and digitalization within the company. In addition, its achievements include the expansion of resources derived from renewable raw materials, as well as the acquisition of a subsidiary in Australia and production facilities in France and Canada, which operate in cooperation with external partners. He also significantly advanced Klasmann-Deilmann’s positioning as a global pioneer of sustainable development in the growing media industry, thereby making a decisive contribution to the company’s economic growth.
With Jan Astrup, Klasmann-Deilmann is getting an internationally experienced manager who has proven himself in the company and has extensive experience in raw materials, production, process optimization and technology. With the new CEO, raw materials and technology-driven areas for the substrate industry are now increasingly important at senior management level. Jan Astrup will strengthen the core commercial horticulture business and help develop the company for the future.
For more information:
Klasmann-Deilmann GmbH
(email protected)
www.klasmann-deilmann.com
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